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Test if remote TCP port is open from a shell script
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In Bash using pseudo-device files for TCP/UDP connections is straight forward. Here is the script:
#!/usr/bin/env bash
SERVER=example.com
PORT=80
</dev/tcp/$SERVER/$PORT
if [ "$?" -ne 0 ]; then
echo "Connection to $SERVER on port $PORT failed"
exit 1
else
e...
Binary Data in JSON String. Something better than Base64
...nary natively such as RabbitMQ message, ZeroMQ message, or a custom TCP or UDP socket.
– Dan H
Aug 1 '19 at 21:20
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Use of Application.DoEvents()
...I have been using Application.DoEvents without problems until I added some UDP features to my code, which resulted in the problem described here. I'd love to know if there's a way around that with DoEvents.
– darda
Mar 31 '13 at 18:42
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How to link Docker services across hosts?
...virtual network technology that acts as a virtual ethernet switch over TCP/UDP - all you need is a Docker container running Weave on your host.
What's interesting here is
Instead of links, use static IPs/hostnames in your virtual network
Hosts don't need full connectivity, a mesh is formed based ...
TCP loopback connection vs Unix Domain Socket performance
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What about local UDP?
– CMCDragonkai
Nov 18 '14 at 11:10
2
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How to programmatically send SMS on the iPhone?
... if you need complete automation. (ie, your program on the iPhone sends a UDP packet to your server, which sends the real SMS)
iOS 4 Update
iOS 4, however, now provides a viewController you can import into your application. You prepopulate the SMS fields, then the user can initiate the SMS send ...
使用Activity启动器组件 · App Inventor 2 中文网
... 我要反馈
使用Activity启动器组件
使用Activity启动器组件
启动其他 App Inventor 应用程序
从 App Inventor 应用程序启动内置 Android 应用程序
启...
On localhost, how do I pick a free port number?
...s accessible when the listener receives data.
I presume you will be using UDP for this?
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...ulimit 内键指令的主要功能以及用于改善系统性能的 ulimit 使用方法。通过这篇文章，读者不仅可以了解 ulimit 所起的作用，并且可以学会如何更好地通过 ulimit 限制资源的使用来改善系统性能。
概述
系统性能一直是一个受关...
支撑Github的开源技术 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...一个新的类目：支撑Github的开源技术，这里列举了Github所使用的一些主要的开源项目。
如下是这些开源项目的介绍：
linguist
语言识别库，能够自动根据项目的代码来识别你所使用的语言。 在你的项目源代码页面，可以看...